Re: ext4 filesystem corruption with 4.10-rc2 on ppc64le

On Wednesday, January 04, 2017 04:18:08 PM Anton Blanchard wrote:

Hi,

I'm consistently seeing ext4 filesystem corruption using a mainline
kernel. It doesn't take much to trigger it - download a ppc64le Ubuntu
cloud image, boot it in KVM and run:

sudo apt-get update
sudo apt-get dist-upgrade
sudo reboot

And it never makes it back up, dying with rather severe filesystem
corruption.

Hi,

The patch at https://patchwork.kernel.org/patch/9488235/ should fix the
bug.

I've narrowed it down to:

64e1c57fa474 ("ext4: Use clean_bdev_aliases() instead of iteration")
e64855c6cfaa ("fs: Add helper to clean bdev aliases under a bh and use it")
ce98321bf7d2 ("fs: Remove unmap_underlying_metadata")

Backing these patches out fixes the issue.

Anton
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chandan